Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add mathiasbourgoin/roster --skill arch-index-orientgit clone --depth 1 https://github.com/mathiasbourgoin/rosterWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mathiasbourgoin/roster/arch-index-orient)<a href="https://agentmods.dev/skills/mathiasbourgoin/roster/arch-index-orient"><img src="https://agentmods.dev/badge/skills/mathiasbourgoin/roster/arch-index-orient/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mathiasbourgoin/roster/arch-index-orient"><img src="https://agentmods.dev/badge/skills/mathiasbourgoin/roster/arch-index-orient.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00020 | $0.00282 |
| Opus 5.5 | $0.00008 | $0.00113 |
| Sonnet 5.5 | $0.00004 | $0.00056 |
| Haiku 4.5 | $0.00002 | $0.00028 |
Grade A, and why
arch-index-orient scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 27d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
arch-index-orient
Run bash orient.sh <callers|callees|fan-in|definition|path> [symbols] from the
project root. A successful result starts with an index freshness header, then
a JSON array. callers and callees list observed resolved edges, fan-in
counts distinct observed callers, definition lists matching function rows,
and path shows one observed resolved path of at most 20 edges. Results are
capped at 10 rows; unresolved targets and MAY_TOP are not expanded. An empty
array means no observed result, never proof of absence.
The shared adapter supports arch-index CMT main-schema versions 1.15–1.18 only.
It checks callgraph_contract=v1, arch_index_cmt producer runs with
sound_with_top, row-level provenance, and edge kinds. Missing or unsupported
data exits 3 before the freshness header. Heuristic LSP indexes are unsupported.
The DB is opened read-only; this skill does not refresh it.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 27d ago Changed · -42 lines · -21 tokens per session 380721f843fe
- 1mo ago First seen · 68 lines · 41 tokens per session scan A 1b2a0a3e6c76
arch-index-orient is a skill published in the GitHub repository mathiasbourgoin/roster (2 stars, last pushed 6d ago), licensed MIT. It adds 20 tokens to every session and 282 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-12.
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